The 2009 Kentucky Derby was the 135th running of the Kentucky Derby. The value of the race was $2,177,000 in stakes.[1] The race was sponsored by Yum! Brands and hence officially was called Kentucky Derby Presented by Yum! Brands.[1] The race took place on May 2, 2009, and was televised in the United States on the NBCtelevision network. The Atlanta-based Southern Tourism Society named the Kentucky Derby Festival, which was April 11 to May 1, as one of the top tourist attractions in the Southeast for the first half of 2009.[2] The post time was 6:24 p.m. EDT (10:24 p.m. UTC).[3] The official attendance at Churchill Downs was 153,563.[4]

"Down toward the inside coming on through, that is, uh, Mine That Bird, now is coming on to take the lead as they come to the finish. In a spectacular...spectacular upset...Mine that Bird has won the Kentucky Derby! An impossible result here!"

The ending of the race came as a complete and utter shock to those in attendance as Mine That Bird, trained by "Chip" Woolley, Jr. and ridden by Calvin Borel, came back from dead last out of the first turn to take the lead in the final furlong. He took the lead so fast after the final turn that NBC Sports race announcer Tom Durkin didn't notice that the gelding took the lead until it had a three-length opening ahead of the pack. Mine That Bird had the longest margin of victory in over 60 years, and was the longest-odds horse to win the Derby in over 85 years.[5]

I Want Revenge was scratched on the morning of the race because of lameness issues in the colt's left front ankle.[8] In addition, Quality Road, who had been an early favorite,[9] was withdrawn from the race on April 27 because of a quarter crack in his right front hoof.[10]

Churchill Downs scheduled their first futures wager pool for the year to begin on February 12, with two subsequent pools opening on March 12 and April 2. Offering 24 betting options (23 individual horses at odds ranging from 10-1 to 50-1, and an "All others" option at 5-2 odds), favorites include Capt. Candyman Can and Old Fashioned at 10-1, followed by Friesan Fire, Midshipman, Pioneerof the Nile, Stardom Bound, This Ones for Phil, and Vineyard Haven at 12-1.[11]

After the starter draw for the running, I Want Revenge was installed as the 3-1 morning line favorite.[12] His scratch later in the morning marked the first time that the morning line favorite was scratched on the day of the race.

Building on the longstanding tradition of drinking, partying, and general revelry in the infield, Churchill Downs officials announced that they are accepting applications to be the second "Chief Party Officer." According to Chief Marketing Officer Dave Tompkins, "The non-stop revelry can test the most die-hard partiers, so a CPO candidate must be able to take the reins and lead our infield nation to new heights of fun and frivolity."[13] In an effort to promote the position, Tim "Stymie" Snyder, the 2008 Chief Party Officer, attended Super Bowl XLIII to personally recruit applicants.[14] The winner was announced March 6, and prizes include use of an RV (billed as a "luxurious boardroom on wheels") for the year.[15] This year's Chief Party Officer is Nick Ferrara.

On November 1, 2008, Churchill Downs unveiled the 2009 Kentucky Derby logo. At the same time, they unveiled the 2009 Kentucky Oaks logo with similar design elements, as well as undated versions of each, which officials indicated will be used year-round.[16][17]